Mapping curbstones in airborne and mobile laser scanning data
Mapping curbstones in airborne and mobile laser scanning data
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DOI：
10.1016/j.jag.2012.01.024
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发表时间：
2012-08-01
影响因子：
7.5
通讯作者：
Vosselman, George
中科院分区：
文献类型：
--
作者：
Zhou, Liang;Vosselman, George
通过今天的激光扫描系统获得的高点密度使得能够提取传统上通过摄影测量或土地测量绘制的各种特征。虽然在从密集点云中提取建筑物和树木方面取得了重大进展，但对道路的提取研究很少。在本文中，它是分析到什么程度可以映射道路两侧的点云的高密度点。在城市地区，路缘石通常用于将路面与相邻的人行道分开。这些路缘石的绘制分为三个步骤。首先，检测地形表面附近具有小高度跳跃的位置。其次，在高度跳跃的两侧上的高点和低点的中点被生成，将其放置在序列中以获得描述路缘石的近似位置的多边形链。然后将S形函数拟合到多边形链附近的所有点以提高精度。第三，闭合附近和共线线段之间的小间隙。GPS测量被用来分析路边检测的性能。分析表明，机载激光扫描（ALS）数据的完整性在53%和92%之间变化，高于移动的激光扫描（MLS）数据的完整性在54%到83%之间变化，这取决于阻塞路边石的停放汽车的数量。与地面测量的GPS点比较，ALS数据和MIS数据的RMS值分别为0.11 m和0.06 m。(C)2012爱思唯尔有限公司版权所有。
The high point densities obtained by today's laser scanning systems enable the extraction of various features which are traditionally mapped by photogrammetry or land surveying. While significant progress has been made in the extraction of buildings and trees from dense point clouds, little research has been performed on the extraction of roads. In this paper it is analysed to what extent road sides can be mapped in point clouds of high point density. In urban areas curbstones are often used to separate the road surface from the adjacent pavement. These curbstones are mapped in a three step procedure. First, the locations with small height jumps near the terrain surface are detected. Second, midpoints of high and low points on either side of the height jump are generated, put in a sequence to obtain a polygonal chain describing the approximate curbstone location. A sigmoidal function is then fitted to all points near the polygonal chain to increase the accuracy. Third, small gaps between nearby and collinear line segments are closed. GPS measurements were taken to analyse the performance of the road side detection. The analysis showed that the completeness in airborne laser scanning (ALS) data varying between 53% and 92% is higher than that in mobile laser scanning (MLS) data ranging from 54% to 83%, depending on the amount of parked cars occluding the curbstones. The RMS value in the comparison with the GPS points measured from ground survey was 0.11 m in ALS data and 0.06 m in MIS data, respectively. (C) 2012 Elsevier B.V. All rights reserved.